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is a significant concern for physicians. Central. o- n8 d; Y+ h! [& V
precocious puberty (CPP), which is mediated7 l) v- F2 \! L$ \8 a
through the hypothalamic pituitary gonadal axis, has6 f. B6 ^6 W6 ?! W8 Y& g9 I
a higher incidence of organic central nervous system( A( n- G5 h1 O+ z; J! Q! `
lesions in boys.1,2 Virilization in boys, as manifested
) A* C+ N- q6 D; W0 Bby enlargement of the penis, development of pubic& x V% v, k; R1 u! P9 `" @
hair, and facial acne without enlargement of testi-: i) l. q3 S% O6 Q" l* B
cles, suggests peripheral or pseudopuberty.1-3 We2 u3 z( B- x( P$ G
report a 16-month-old boy who presented with the
8 n# _3 \! F. p4 Y' ]enlargement of the phallus and pubic hair develop-
- _- ?6 n- U5 }. oment without testicular enlargement, which was due
8 {, i: O! }6 Vto the unintentional exposure to androgen gel used by& M" F: I8 l- Y
the father. The family initially concealed this infor-
& g/ T: m4 }+ n' pmation, resulting in an extensive work-up for this
9 V- J% k8 {7 F, |+ n& ]child. Given the widespread and easy availability of' M+ e- G: U. Z
testosterone gel and cream, we believe this is proba-5 f: |; t6 M4 {* m' a# y9 e& U
bly more common than the rare case report in the
& M7 A- U) T# d; Bliterature.4
5 E1 v4 W+ W; c1 U% v9 D0 UPatient Report
* J$ h+ E1 Y+ K# }0 E0 i0 t( vA 16-month-old white child was referred to the
5 n" [: j1 I& E* B: f hendocrine clinic by his pediatrician with the concern
. G1 v& i7 x0 G0 jof early sexual development. His mother noticed
# ?4 e1 A. u" Nlight colored pubic hair development when he was
E/ A9 ?3 c& O" f9 IFrom the 1Division of Pediatric Endocrinology, 2University of
! B1 h2 |3 t+ m: K% @. @South Alabama Medical Center, Mobile, Alabama.( E' q q1 U0 A0 U( |- Z
Address correspondence to: Samar K. Bhowmick, MD, FACE,& z5 i" ]# U+ g; @
Professor of Pediatrics, University of South Alabama, College of3 |+ E S; `; ?
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
Z+ ~7 l1 Q$ [( B- xe-mail: [email protected].
( v- B" v& X8 s% L: W5 {4 rabout 6 to 7 months old, which progressively became
% p: l6 b4 F) @- Qdarker. She was also concerned about the enlarge-
, f0 P/ P- m6 R& x; f; [# f, X$ E1 yment of his penis and frequent erections. The child
% W7 I, P" W! swas the product of a full-term normal delivery, with
$ j2 g' O/ t2 ^8 ca birth weight of 7 lb 14 oz, and birth length of
$ E+ m# [) O% L9 @20 inches. He was breast-fed throughout the first year
/ p* F9 h2 Q, L- R0 pof life and was still receiving breast milk along with
5 p) n e" x6 j' osolid food. He had no hospitalizations or surgery,# q: _- R0 @+ O, D
and his psychosocial and psychomotor development
$ I- V7 K8 U8 E, i/ u f; Zwas age appropriate.- p+ @# B# { V. `, Z( G; B
The family history was remarkable for the father,; c+ O. M2 F8 }4 f3 b
who was diagnosed with hypothyroidism at age 16, d$ K& n9 D0 P; s0 K9 H' i7 U( u6 V
which was treated with thyroxine. The father’s
# o& E* p& P- b" G2 zheight was 6 feet, and he went through a somewhat
" f G5 N7 }# o- i8 ~; H4 [early puberty and had stopped growing by age 14.% L6 J/ |5 v8 W* M/ d& C
The father denied taking any other medication. The
8 B/ A% o/ {" i+ [child’s mother was in good health. Her menarche/ t4 `/ G) @- i g. m8 K
was at 11 years of age, and her height was at 5 feet
1 J3 [0 d. `" ^, K5 inches. There was no other family history of pre-
0 Q9 c0 T5 e l6 ^cocious sexual development in the first-degree rela-$ K8 _* D' @" X2 Y1 S# t3 U
tives. There were no siblings. Z8 Q1 i1 h5 j" {
Physical Examination
7 K" q* M+ a* |2 Q* ZThe physical examination revealed a very active,
& S& Y n( v% x: _playful, and healthy boy. The vital signs documented
8 k) G6 v/ W+ ?# F5 }0 J4 ga blood pressure of 85/50 mm Hg, his length was& u; T' r3 y, X' m% ~0 n6 `; W! D
90 cm (>97th percentile), and his weight was 14.4 kg7 h4 k% N4 Q, w/ g
(also >97th percentile). The observed yearly growth
' P4 |9 I% u4 ~; Z% S# yvelocity was 30 cm (12 inches). The examination of2 `$ `, Q+ A$ e j9 N4 J
the neck revealed no thyroid enlargement.$ `. l# b9 D) Z5 y0 t8 Y
The genitourinary examination was remarkable for
6 k: t* j# N" v5 _) senlargement of the penis, with a stretched length of/ f- q2 K" Q I8 e( v
8 cm and a width of 2 cm. The glans penis was very well/ M' f; q: D, C/ k
developed. The pubic hair was Tanner II, mostly around f8 i! Y, m/ I+ p0 [" Y
540 l6 t! s2 D3 ~/ ?0 z4 L
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
/ P4 C, T5 y+ T' mthe base of the phallus and was dark and curled. The
7 E8 E# r) ^$ R) X, u$ jtesticular volume was prepubertal at 2 mL each.
! O% y* Q% J7 VThe skin was moist and smooth and somewhat
1 w7 h7 l: ? i! woily. No axillary hair was noted. There were no
& m& Q" T# Q: Z7 habnormal skin pigmentations or café-au-lait spots.
% [* U! e5 ^5 D& S( J) h" eNeurologic evaluation showed deep tendon reflex 2+0 C- V, O' D' |: _
bilateral and symmetrical. There was no suggestion5 e( D' r0 u& P/ f. i6 S: V
of papilledema.
" p/ H& \6 ^: g1 |# Y, r8 ^. H; DLaboratory Evaluation" \: `3 E! W5 ~* _9 \9 N: o" F
The bone age was consistent with 28 months by
) k+ f, d3 d2 R& e) F- @using the standard of Greulich and Pyle at a chrono-8 K, C5 r4 |- o! p+ h: b0 C
logic age of 16 months (advanced).5 Chromosomal8 E# t( K5 W" G5 Y2 i# C! T
karyotype was 46XY. The thyroid function test1 H8 ~+ X! b P' E1 R
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
. G1 s: o+ i9 {# R2 B* L, V' ]lating hormone level was 1.3 µIU/mL (both normal).
' r% B) t3 O/ n* JThe concentrations of serum electrolytes, blood
: m; }# q, `* V5 m$ ^9 L- \urea nitrogen, creatinine, and calcium all were
1 k. M' J3 f" A9 V; {! f) awithin normal range for his age. The concentration
3 w: [. j( i+ ]) K5 dof serum 17-hydroxyprogesterone was 16 ng/dL
' e" V" z7 o5 J6 K(normal, 3 to 90 ng/dL), androstenedione was 20
8 n2 f2 z% ]* I3 f9 t2 U* Jng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
; i4 \! O; I c* U, ~terone was 38 ng/dL (normal, 50 to 760 ng/dL),: h- ?- A8 q7 r6 p5 a7 b
desoxycorticosterone was 4.3 ng/dL (normal, 7 to. t) b( K( F# l
49ng/dL), 11-desoxycortisol (specific compound S)% O3 T5 K j9 ~$ U. J( D9 ^
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
; E( d" ~8 F; B6 c0 Xtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total8 c# ~6 R- t8 J! x8 e% J" R
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
. z/ G! E) u7 f8 B% Mand β-human chorionic gonadotropin was less than
8 i X+ C V5 |8 D' ^; I9 H3 _3 S5 mIU/mL (normal <5 mIU/mL). Serum follicular4 h. q! Q9 u( C4 Z. ?. o
stimulating hormone and leuteinizing hormone5 O p; L6 K, U
concentrations were less than 0.05 mIU/mL& R6 {: G, [7 @( v) h8 o" A/ a
(prepubertal).
0 W1 v# \- i, fThe parents were notified about the laboratory2 Q8 ^/ Z+ K) v; t
results and were informed that all of the tests were
- x( [0 {# {' o5 [% r7 Cnormal except the testosterone level was high. The
; H( W9 c8 U( B3 b" D$ b" Y# o9 xfollow-up visit was arranged within a few weeks to
2 J- t6 o6 `% Fobtain testicular and abdominal sonograms; how-
3 e+ |, L; ]/ I2 U r$ uever, the family did not return for 4 months.) N$ y5 a6 h' A m$ s+ F( z
Physical examination at this time revealed that the
% M, { P& O% T2 y+ R+ S0 Vchild had grown 2.5 cm in 4 months and had gained
9 Z! I' w* D2 i4 {; K) H+ p2 kg of weight. Physical examination remained
9 o4 l6 i9 D7 \5 lunchanged. Surprisingly, the pubic hair almost com-
# c' s0 O* x- c3 e: }pletely disappeared except for a few vellous hairs at
6 C/ R( T6 _) Sthe base of the phallus. Testicular volume was still 2: S( _6 Q3 [; W* R/ X
mL, and the size of the penis remained unchanged.0 r: m$ q4 c6 m+ g" o
The mother also said that the boy was no longer hav-
1 v d: ?' J0 y8 k4 W+ V' X0 zing frequent erections.
5 Q4 H: n) r) q1 J8 aBoth parents were again questioned about use of& r3 ^0 Y7 K8 \7 u; P3 ]$ B
any ointment/creams that they may have applied to
7 v' m" V9 z7 `) G. C; @the child’s skin. This time the father admitted the5 ^& Y0 C% I. \& n5 ]7 o+ I& u* h
Topical Testosterone Exposure / Bhowmick et al 541 l: \$ ^3 g# c
use of testosterone gel twice daily that he was apply-
' M( E- K4 c* ning over his own shoulders, chest, and back area for
" b1 i5 T* b& L) |& d, }# G' za year. The father also revealed he was embarrassed
4 y% y, C$ |' J- r' Tto disclose that he was using a testosterone gel pre-
+ r, u: G8 i0 d }9 Hscribed by his family physician for decreased libido# E6 V3 w3 L0 o
secondary to depression.
0 d' f. O* _+ S) N& HThe child slept in the same bed with parents.% r& C7 T+ w* L$ Q
The father would hug the baby and hold him on his9 O" |0 ~+ G* `9 Z% b
chest for a considerable period of time, causing sig-1 e: B) O6 r5 |. g2 \4 }" v
nificant bare skin contact between baby and father.
8 \& z0 O4 z, G* L# ]& I2 `The father also admitted that after the phone call,
5 d. Q1 o- @( g6 o* T. Lwhen he learned the testosterone level in the baby) T3 r( G- {+ r: k6 X" b
was high, he then read the product information
S$ P6 b; _. e- ppacket and concluded that it was most likely the rea-
7 C1 o# E! T6 J- Lson for the child’s virilization. At that time, they
9 O+ ]0 Z5 S# zdecided to put the baby in a separate bed, and the
, K% F$ [! H7 r6 n% M* C4 Lfather was not hugging him with bare skin and had
) x9 }$ p- T9 P! Mbeen using protective clothing. A repeat testosterone
, e( }1 x b# X7 Q& {' Xtest was ordered, but the family did not go to the
& |2 e1 Z! C- Z; k: j4 glaboratory to obtain the test.
8 i2 _1 @. U& ~7 S2 a. qDiscussion/ S# x/ K" ?' a1 @0 A7 h$ X+ {+ E
Precocious puberty in boys is defined as secondary# j% d8 R0 i1 D# L7 _
sexual development before 9 years of age.1,4
6 @2 v* X8 I6 w- p [0 V2 }+ tPrecocious puberty is termed as central (true) when) ? X' {7 A5 L- S: j& H5 f
it is caused by the premature activation of hypo-) x3 F; p% o& V, Z
thalamic pituitary gonadal axis. CPP is more com-
$ E- M. ~7 {6 j* I) ~) P& Rmon in girls than in boys.1,3 Most boys with CPP5 m( b8 V% G }) M+ P* L
may have a central nervous system lesion that is
. k# M3 r5 B( p- k* F2 lresponsible for the early activation of the hypothal-
; q+ k1 g3 |+ }1 [+ A& c& kamic pituitary gonadal axis.1-3 Thus, greater empha-
O5 h( Z9 K8 g- w9 p" ssis has been given to neuroradiologic imaging in
: v1 T1 \- c2 i/ sboys with precocious puberty. In addition to viril-
9 P! l* Q0 i5 z& o: t8 Q1 vization, the clinical hallmark of CPP is the symmet-
0 f, T i! _- V8 {$ xrical testicular growth secondary to stimulation by" B) J* }4 F2 C8 u+ m
gonadotropins.1,3! `; ~( k) T( a
Gonadotropin-independent peripheral preco-
- z6 @7 P. h B% D2 H3 ncious puberty in boys also results from inappropriate
; ?1 j$ M% f; _- L( d; ^0 {9 ^% t* Uandrogenic stimulation from either endogenous or7 i: T, U" `( W1 K: m3 O5 X
exogenous sources, nonpituitary gonadotropin stim-3 v3 n' F( q( v: b" ^; k* L/ `
ulation, and rare activating mutations.3 Virilizing9 l* u6 J' v) J: w
congenital adrenal hyperplasia producing excessive- I f& O' \& M6 d) e' G
adrenal androgens is a common cause of precocious+ @8 E" B/ P7 y+ J5 K5 `; o
puberty in boys.3,4
2 [# O# f1 J: g( X8 fThe most common form of congenital adrenal
6 N- x: \4 Z Khyperplasia is the 21-hydroxylase enzyme deficiency.. p. H$ W+ F0 D
The 11-β hydroxylase deficiency may also result in$ p7 X! V, a9 ?( `1 `" i$ {* C
excessive adrenal androgen production, and rarely,
* T1 V2 g$ J- Man adrenal tumor may also cause adrenal androgen
2 x$ @5 N% Y4 a L V# Eexcess.1,3
& {) L$ o& t. `! v8 [( U$ e' Uat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
4 p* m, c9 p$ K& E R3 x+ y542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
, G F. E7 Q7 B8 oA unique entity of male-limited gonadotropin-) a& E% R' D0 k
independent precocious puberty, which is also known' H4 G: ?1 t2 i3 P& @% h9 t% i: }
as testotoxicosis, may cause precocious puberty at a
/ p: ?# M7 y% @0 W- [very young age. The physical findings in these boys
( M9 ~" z, D K0 u% }with this disorder are full pubertal development," {/ s. w) E5 j+ S# M& P' X
including bilateral testicular growth, similar to boys
( W% V* ?6 U) Hwith CPP. The gonadotropin levels in this disorder9 x" @! T/ E. h. s8 B6 L/ M
are suppressed to prepubertal levels and do not show" ?* v0 r( o% x" u7 a3 {' f$ q$ { z
pubertal response of gonadotropin after gonadotropin-
/ u& J4 u, G* t8 f4 ?releasing hormone stimulation. This is a sex-linked
% l, |7 P1 b( X, y* W, iautosomal dominant disorder that affects only* {% S8 V- b/ V
males; therefore, other male members of the family
' w" I4 h- P. y& c" Wmay have similar precocious puberty.3
, P; }" ]. t4 Z' i6 IIn our patient, physical examination was incon-
0 T0 G+ O) o1 q. ?. F7 M! J; @, jsistent with true precocious puberty since his testi-
, G2 P; l) F2 Q9 M& s# s5 }4 U: X0 Dcles were prepubertal in size. However, testotoxicosis
" Z6 J9 e5 E" G% qwas in the differential diagnosis because his father
7 j3 L, |2 b1 W# Ostarted puberty somewhat early, and occasionally,* b" D# d2 j# R+ l+ ^1 v
testicular enlargement is not that evident in the$ s* c* H5 i/ h3 w j1 |
beginning of this process.1 In the absence of a neg-" [% | @5 f' n9 r9 M
ative initial history of androgen exposure, our
7 n6 L4 U6 p1 n7 b$ _! Bbiggest concern was virilizing adrenal hyperplasia,3 B; K% D1 V: p4 P4 ^6 k. x% H7 q
either 21-hydroxylase deficiency or 11-β hydroxylase
3 J# U1 G1 Q7 T6 T8 rdeficiency. Those diagnoses were excluded by find-$ N5 C+ P+ l+ k1 S0 g a, ~, A
ing the normal level of adrenal steroids.
. ~9 q% ]& k; S+ [The diagnosis of exogenous androgens was strongly
9 H% R! [$ R' J! ]4 E; _suspected in a follow-up visit after 4 months because- a3 b3 K- K/ ~& c0 v: b$ q
the physical examination revealed the complete disap-9 A# x6 Y0 `8 w6 y' a9 B
pearance of pubic hair, normal growth velocity, and
5 P1 h) s2 S5 q8 zdecreased erections. The father admitted using a testos-1 g" p$ R6 w' N/ w
terone gel, which he concealed at first visit. He was
2 K, G$ h0 H( P" x2 ~8 busing it rather frequently, twice a day. The Physicians’
' o) B0 W3 b) ~; }Desk Reference, or package insert of this product, gel or- \, b5 Z4 @. d( u0 M/ N3 F
cream, cautions about dermal testosterone transfer to$ Q: G. A) {/ R/ Q
unprotected females through direct skin exposure.2 [: p5 d( l$ Y# @
Serum testosterone level was found to be 2 times the
; z2 E0 _4 z$ i: _baseline value in those females who were exposed to5 \0 p2 J# Q1 c
even 15 minutes of direct skin contact with their male
6 P S d: D1 k8 Hpartners.6 However, when a shirt covered the applica-5 N# e1 T" |: Z2 w
tion site, this testosterone transfer was prevented.! _% j' ~8 i0 Z4 X# g- f$ b; }
Our patient’s testosterone level was 60 ng/mL,
" l- T- D6 ` W4 l) I% ^which was clearly high. Some studies suggest that
4 B* o, s9 x8 `& l, U) @; xdermal conversion of testosterone to dihydrotestos-
Q' G& v& b9 S7 P y! @- z) z; o$ vterone, which is a more potent metabolite, is more
0 }5 @2 K3 s7 h, S% I) B6 Oactive in young children exposed to testosterone" K- Q4 {! G/ n9 L
exogenously7; however, we did not measure a dihy-
# `% O" ~" _- X1 p- ]( [- odrotestosterone level in our patient. In addition to
2 p2 \* K: J5 y7 R8 {0 yvirilization, exposure to exogenous testosterone in3 \: [7 l3 t; B
children results in an increase in growth velocity and* D- E& O+ n @* l
advanced bone age, as seen in our patient.
+ N4 N1 E7 w6 j) gThe long-term effect of androgen exposure during# X' g) b5 b& z# v
early childhood on pubertal development and final
' J7 f2 T, F, n% Uadult height are not fully known and always remain2 C0 p) Z! |* z# O( X6 ]( P
a concern. Children treated with short-term testos-
. y! s9 }: d6 j* |/ V0 E8 z+ h. C! Kterone injection or topical androgen may exhibit some
; e4 U7 G5 z9 I' o* Racceleration of the skeletal maturation; however, after m1 K0 K i/ r! c, ^9 W/ t
cessation of treatment, the rate of bone maturation
- `/ g* K- h% y( m- L/ C% ^5 `decelerates and gradually returns to normal.8,9
4 q7 {+ `) m8 ?4 V2 v! @There are conflicting reports and controversy1 }1 U. L n' o8 Y s E2 v
over the effect of early androgen exposure on adult! ]2 Q" Y, ~) P6 V
penile length.10,11 Some reports suggest subnormal
* l' h. a f; S# Dadult penile length, apparently because of downreg-
. a' `8 T) S- b, @7 Z" x1 ^' t$ Zulation of androgen receptor number.10,12 However,, v9 {- y" f8 c" m) r+ e$ R l
Sutherland et al13 did not find a correlation between
" I8 g) x3 D1 u0 `9 ]4 ?childhood testosterone exposure and reduced adult, N8 ?! U# c: ]
penile length in clinical studies.8 [9 |# t$ D0 d7 i
Nonetheless, we do not believe our patient is% h8 i T `5 l" p- u" Z( Z2 V
going to experience any of the untoward effects from
/ i ^; y3 Q h5 \$ \testosterone exposure as mentioned earlier because& k" M( U) g' J2 k
the exposure was not for a prolonged period of time.0 O x/ u/ j$ l) D* C4 U- e
Although the bone age was advanced at the time of" X+ U' `0 W, W5 U' I7 m
diagnosis, the child had a normal growth velocity at! p) x ] m5 N1 d; q
the follow-up visit. It is hoped that his final adult4 _# r% g- t9 O$ w
height will not be affected." y5 y/ N. U4 o7 V, w: t& ~
Although rarely reported, the widespread avail-
- a- D1 b @7 r% F9 y8 d5 ?- pability of androgen products in our society may8 y% S5 a% G5 I: K: N+ b
indeed cause more virilization in male or female( E$ g/ b9 O$ p ?' X; Y, W. o
children than one would realize. Exposure to andro-
# B; y0 @, a" e1 ^5 _gen products must be considered and specific ques-
0 x# V8 k2 A1 d! T% R+ p+ J/ Xtioning about the use of a testosterone product or
# D. x# M4 P, }* t8 {; q' ^3 Vgel should be asked of the family members during4 X% I' T! l( E( E( Y/ M) w
the evaluation of any children who present with vir-2 G% Z& n" K2 }1 J Q
ilization or peripheral precocious puberty. The diag-
: `- _6 G/ x+ y) n5 Pnosis can be established by just a few tests and by) [: k% q/ S, i! {+ D7 H
appropriate history. The inability to obtain such a
# D% f7 Y6 @; E, W* S2 ?* W6 xhistory, or failure to ask the specific questions, may/ Q6 k" v0 `, B
result in extensive, unnecessary, and expensive0 h3 p- c! K' {/ X% }
investigation. The primary care physician should be
2 |9 _0 g. d9 \/ y6 \6 s% Daware of this fact, because most of these children
2 ?& y7 I" o1 p3 J! r0 O$ S( ~) _may initially present in their practice. The Physicians’$ z) C) K) E. O, ]# h1 G' q0 [
Desk Reference and package insert should also put a0 i- V4 g" q1 ]; }& v, l; U
warning about the virilizing effect on a male or" Q/ Y( }9 F; n% A8 N' z
female child who might come in contact with some-: U) O5 G, J2 h# Q% h# `. |
one using any of these products.
7 I+ P3 |$ k# R% A6 nReferences
. m. q0 q, T5 d* e/ v1 T1. Styne DM. The testes: disorder of sexual differentiation( i, M3 ^% [3 Q/ i0 |
and puberty in the male. In: Sperling MA, ed. Pediatric' z' x9 @# g& u8 L' ~8 |* ?9 C, D9 W
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
2 R0 o! q! s" O$ q2002: 565-628.7 i0 F) r# v+ R% h. F% v
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
: d2 P- j& H! n9 ^puberty in children with tumours of the suprasellar pineal
/ ^4 \0 D0 Z, k6 Tat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from) l1 W# j8 s' L" O* k% I
Topical Testosterone Exposure / Bhowmick et al 543
" m e, Y. k5 Mareas: organic central precocious puberty. Acta Paediatr.( z% o9 Y, ]$ w5 }; v( o
2001;90:751-756.
7 O5 O- b! Y! \. b3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
) Q! l% F& Z% e6 f4 Y |. ?Pediatric Endocrinology. 4th ed. New York, NY: Marcel: Y' e1 @1 y0 u; T, R
Dekker Inc; 2003:211-238.1 t/ ^/ R# J: _! g; N
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual' J2 f5 v: {: Z3 X
development in a two-year-old boy induced by topical
* x+ s- Q5 F6 N( E% g" \exposure to testosterone. Pediatrics. 1999;104:e23.! n1 ~8 ]7 ?+ j9 g
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of$ ~0 K6 ?' L* I k0 N2 t' C4 d" n
Skeletal Development of the Hand and Wrist. 2nd ed.
# q/ Q8 `( B! i! `, r' bStanford, CA: Stanford University Press; 1959.; u& s+ g0 t) _/ \3 o
6. Physicians’ Desk Reference. Androgel 1% testosterone,$ b: @+ c' l5 q
Unimed Pharmaceutical Inc. Montvale, NJ: Medical
, H% t3 k: o5 r5 _Economics Company, Inc; 2004:3239-3241.8 O; f0 _0 e7 j& C: @8 y. z
7. Klugo RC, Cerny JC. Response of micropenis to topical
5 |9 a/ M2 Q' o& |8 ^testosterone and gonadotropin. J Urol. 1978;119:' h- [; J) e4 Z) U) n x% B. G) ~
667-668.
8 R# |$ B9 k- h: U8. Guthrie RD, Smith DW, Graham CB. Testosterone
/ |$ o) C" h& V$ T3 d* c/ ?treatment for micropenis during early childhood. J Pediatr.& q! Q9 e: c; Y
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