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is a significant concern for physicians. Central3 Z4 A( x. ~* e- V
precocious puberty (CPP), which is mediated! h% z1 S, e% ?) }
through the hypothalamic pituitary gonadal axis, has& d/ s8 ]" R& ]$ t7 |1 m
a higher incidence of organic central nervous system
& T% y; V6 O. U0 olesions in boys.1,2 Virilization in boys, as manifested, H( p, w0 \* Y5 P9 |
by enlargement of the penis, development of pubic* H6 d9 V7 L, F6 ^' l" A7 Z2 w6 T
hair, and facial acne without enlargement of testi-6 K: u1 m3 k/ X2 B
cles, suggests peripheral or pseudopuberty.1-3 We4 y1 S8 q" ]! W+ U7 u0 c+ z1 `
report a 16-month-old boy who presented with the
# ], S! k8 _% c7 l" ~: benlargement of the phallus and pubic hair develop-3 J! }4 G+ Y; V8 c
ment without testicular enlargement, which was due
( l% i9 r9 C: L( R- Q" @to the unintentional exposure to androgen gel used by
* {% @" ~: k9 d* Qthe father. The family initially concealed this infor-: Q/ q6 K2 j8 l7 i+ ]
mation, resulting in an extensive work-up for this
, U) m1 f! o4 l1 qchild. Given the widespread and easy availability of
% w7 l& _' \! z- N" C& Ttestosterone gel and cream, we believe this is proba-% K. b) i9 b: Q0 V( E
bly more common than the rare case report in the
* Z7 C2 w2 m( o* S# A: a, Cliterature.44 G- G0 F( s a* B8 D
Patient Report+ R V3 ~) Y6 y- M7 G
A 16-month-old white child was referred to the
$ m6 n5 B4 t+ C8 A4 Lendocrine clinic by his pediatrician with the concern" i- s; B! w6 M; S9 c
of early sexual development. His mother noticed
) n" Y/ |, S8 S6 h3 p8 Hlight colored pubic hair development when he was- v6 p7 p8 q4 W2 o# \
From the 1Division of Pediatric Endocrinology, 2University of
- @3 ^9 c* \) q' OSouth Alabama Medical Center, Mobile, Alabama.
3 x/ E1 g& F* T: V0 D8 _Address correspondence to: Samar K. Bhowmick, MD, FACE,
4 Y% M3 P z# v7 SProfessor of Pediatrics, University of South Alabama, College of
" o3 c$ ^8 E) [5 F6 j$ H" D1 Y* h1 xMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
; V6 a* L. i5 z5 ze-mail: [email protected].0 j+ c) F9 {* Y9 i) G
about 6 to 7 months old, which progressively became
3 K+ p' Q E! l, u) b* O5 i' `darker. She was also concerned about the enlarge-& \) i& D, j: \- f$ |8 L
ment of his penis and frequent erections. The child8 S5 S% M) W5 E" Q
was the product of a full-term normal delivery, with7 e4 L* t4 M7 f: Y( c
a birth weight of 7 lb 14 oz, and birth length of( v9 u$ q; j. d& r; W
20 inches. He was breast-fed throughout the first year; Y; u+ H+ E* [/ e7 a( k2 [
of life and was still receiving breast milk along with
P: _, M, k, j' N( a9 Y+ A8 x, Asolid food. He had no hospitalizations or surgery,
7 N( U+ n+ o5 P( s2 H3 D+ Qand his psychosocial and psychomotor development
% h/ d3 y2 d- K z% o6 Y: Zwas age appropriate.' g3 E# c3 L: h
The family history was remarkable for the father,
# R3 y3 n8 v) v' i2 awho was diagnosed with hypothyroidism at age 16,
$ q# M; L( E6 y. qwhich was treated with thyroxine. The father’s
. e# p- b1 m7 {height was 6 feet, and he went through a somewhat
7 T% p" O ~$ M6 ^4 ^$ N8 ^early puberty and had stopped growing by age 14.+ _+ h- N% s5 o y( a: I
The father denied taking any other medication. The
4 U# P. z; _& H+ c4 M4 pchild’s mother was in good health. Her menarche
4 C3 V+ a' ^0 D9 [4 q' twas at 11 years of age, and her height was at 5 feet/ ?6 m @& q: L3 G, t7 }. _0 d5 J
5 inches. There was no other family history of pre-
& N( S' e, m2 i! }" fcocious sexual development in the first-degree rela-2 C# f: W( g# `0 W
tives. There were no siblings.4 ~' P% V+ Y# ^# Y0 P* h1 E
Physical Examination
8 c1 Y- @. u7 O. c. `% l) f$ nThe physical examination revealed a very active,
7 [' [0 A8 E# ^& I1 ?2 h+ cplayful, and healthy boy. The vital signs documented5 |0 z4 d" @# k9 d/ o
a blood pressure of 85/50 mm Hg, his length was
+ ?" s1 q- k5 u/ c1 C+ g* r90 cm (>97th percentile), and his weight was 14.4 kg. r: |) u) ~! P
(also >97th percentile). The observed yearly growth
) a: v; h6 w9 d! evelocity was 30 cm (12 inches). The examination of
; p$ r1 e- l; Z% q4 N9 p0 C; Jthe neck revealed no thyroid enlargement.( u2 N& j8 q7 ]# F/ l
The genitourinary examination was remarkable for0 L( F+ O' I* g" o
enlargement of the penis, with a stretched length of
: Q! s8 x$ m8 ?1 x! [% T ]8 cm and a width of 2 cm. The glans penis was very well2 z, p3 j) l( ^7 R
developed. The pubic hair was Tanner II, mostly around6 ~: t. \6 b8 ]9 B: K9 R
540% y) v, R! Z8 x G$ z
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from7 W9 ^# }: F; i
the base of the phallus and was dark and curled. The4 _6 z- C: _1 U3 k, V$ |) C
testicular volume was prepubertal at 2 mL each.9 T& ?) v4 W$ X, n+ D; ~
The skin was moist and smooth and somewhat
; P+ s' z& n2 n, Z p# d! y& Doily. No axillary hair was noted. There were no
$ Y- B6 a3 C- B- I' L4 S9 Yabnormal skin pigmentations or café-au-lait spots.
5 ^* O* T. v/ }Neurologic evaluation showed deep tendon reflex 2+/ V; H) F9 H! d" Z& ]; W/ T
bilateral and symmetrical. There was no suggestion
9 G z/ o3 k. D0 Zof papilledema.8 `! I! p6 e5 n8 E
Laboratory Evaluation* `" N5 d5 T6 G/ `+ k6 M
The bone age was consistent with 28 months by
% x6 G0 M+ o9 K2 A7 wusing the standard of Greulich and Pyle at a chrono-5 ^: s6 i7 W1 |& C3 |) Q) W7 `6 c
logic age of 16 months (advanced).5 Chromosomal
" a; ^9 N* V4 \, f$ bkaryotype was 46XY. The thyroid function test+ B- O. \& B# x; F
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
1 I! d# F8 I% Hlating hormone level was 1.3 µIU/mL (both normal). ^# W4 _# ?) a* |7 j
The concentrations of serum electrolytes, blood' Z8 u+ k6 G, p, w0 g
urea nitrogen, creatinine, and calcium all were7 P! ~% ?" Z. T# M! Q9 i1 V
within normal range for his age. The concentration6 q9 L m7 E! E2 r
of serum 17-hydroxyprogesterone was 16 ng/dL
) e/ d. h! \* j0 S5 B(normal, 3 to 90 ng/dL), androstenedione was 207 j, n* ]& n9 W# R2 @, U
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros- q8 m3 v6 ], C
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
/ B7 o! U1 r- Xdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
! U4 [3 z( {: s2 E49ng/dL), 11-desoxycortisol (specific compound S)
- U; L5 W, v! L7 l0 c# awas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
( W( V; R/ w4 ~# W+ `$ ptisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
8 U! H! M3 F! H0 Y8 {5 btestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
& ~5 d1 ]$ Q2 z1 O0 H4 x. uand β-human chorionic gonadotropin was less than+ \9 B- U$ m) @: Q
5 mIU/mL (normal <5 mIU/mL). Serum follicular
, {- m; L! f5 q4 kstimulating hormone and leuteinizing hormone
# _9 J+ B0 B' D5 ?concentrations were less than 0.05 mIU/mL
C8 Q8 e _% h; y6 y) j, V(prepubertal).
( q T# w0 n% v, l# z6 G0 g) bThe parents were notified about the laboratory
3 E1 H8 g; m( B+ @7 c: F/ H: cresults and were informed that all of the tests were
) s. [/ x; l f0 M% }/ ?: x: [normal except the testosterone level was high. The
- r( C! G1 X4 a9 _6 J y) x4 Gfollow-up visit was arranged within a few weeks to- \. P3 {7 T8 ]$ }( b$ M
obtain testicular and abdominal sonograms; how-+ T6 B' z- X b2 M' b
ever, the family did not return for 4 months.
' q- A4 }5 k4 S6 m( Y+ f3 A( UPhysical examination at this time revealed that the$ ?: i1 m, ?# _7 r# N
child had grown 2.5 cm in 4 months and had gained$ l) v5 u3 G3 Z# m4 J6 ?) Z' Y, {
2 kg of weight. Physical examination remained
, T+ r8 v3 o; }( l/ bunchanged. Surprisingly, the pubic hair almost com-
5 Z( Y( Y8 `& y3 O5 ~pletely disappeared except for a few vellous hairs at* R4 \3 S- D$ i' J* K
the base of the phallus. Testicular volume was still 2& ^% Q }1 V- N! O6 ~
mL, and the size of the penis remained unchanged.
8 B4 k0 _* C9 p9 h2 U T( e1 p3 r- wThe mother also said that the boy was no longer hav-/ D( s1 ?6 j+ H# P" ], j, H
ing frequent erections.
f& z. E1 Q, m. cBoth parents were again questioned about use of
) d( ?. f, Q& ^# bany ointment/creams that they may have applied to4 A! j. V, L" G& Y, S9 V7 C
the child’s skin. This time the father admitted the9 }7 t$ M- @' O; }+ A
Topical Testosterone Exposure / Bhowmick et al 541" Q* Y) \- _7 ^2 H- X4 x
use of testosterone gel twice daily that he was apply-. c7 |( d1 {% A* S8 ~9 v) A
ing over his own shoulders, chest, and back area for
. o1 B! c& |8 ?0 S3 D% s0 M$ G) [a year. The father also revealed he was embarrassed Y( I# j- r! f& t9 g
to disclose that he was using a testosterone gel pre-
7 q6 o8 @% z% Z- v$ Tscribed by his family physician for decreased libido8 p5 v8 a5 J( `6 Z9 D9 F
secondary to depression.' [: h- D& Z4 m0 Z
The child slept in the same bed with parents.2 k) C: q! x/ o; l( H+ x
The father would hug the baby and hold him on his
& |! W4 M0 f( O" D" mchest for a considerable period of time, causing sig-$ K! ~! x3 `1 G6 B- j' U; I- e9 V
nificant bare skin contact between baby and father.
- T- B, l% a. O% b& p% |The father also admitted that after the phone call,
$ p G. M+ ], i$ a3 _. R0 Vwhen he learned the testosterone level in the baby
9 q" g, U: u* V1 {, {was high, he then read the product information+ {; k8 s' O' m
packet and concluded that it was most likely the rea-
1 v4 P. A) K3 u& v! P) I8 S3 Ison for the child’s virilization. At that time, they+ K1 S" M0 U- x l- {
decided to put the baby in a separate bed, and the5 j) c4 \/ W h) ]0 C8 L1 p8 t
father was not hugging him with bare skin and had
) }6 {+ t( }; l5 i4 m9 @been using protective clothing. A repeat testosterone! x) n! |% m: z
test was ordered, but the family did not go to the
. y% v$ H# l8 T7 l9 Ilaboratory to obtain the test.
. b% d3 |# W$ l- ?* m8 SDiscussion7 W" E6 u5 c7 j, `
Precocious puberty in boys is defined as secondary/ k9 s; p* N8 h4 t9 t
sexual development before 9 years of age.1,4
0 h J" N: i0 y0 d- x K/ |Precocious puberty is termed as central (true) when
4 y8 S$ O% n' f3 ]( y/ ]" dit is caused by the premature activation of hypo-& x' `7 W( M4 X( r. i# L' j) C
thalamic pituitary gonadal axis. CPP is more com-
) @/ f( ^9 G/ @. ?mon in girls than in boys.1,3 Most boys with CPP6 j3 l/ f& Z& v6 |" e
may have a central nervous system lesion that is5 N' m1 _' A3 f2 {0 z
responsible for the early activation of the hypothal-
- c9 h& q9 x% y8 G1 Y% j9 gamic pituitary gonadal axis.1-3 Thus, greater empha-
- ~7 {/ u1 R, Y0 n" Jsis has been given to neuroradiologic imaging in2 i5 N% v4 q$ n3 X
boys with precocious puberty. In addition to viril-
; w& }. J3 v3 z: C( |ization, the clinical hallmark of CPP is the symmet-, {+ k3 S- D& J2 V' _
rical testicular growth secondary to stimulation by- E/ r" I6 ~9 y! f6 s6 C$ ^0 O- p
gonadotropins.1,3, z; P# e; v0 \
Gonadotropin-independent peripheral preco-
o; b( \' F" z' ~! e4 r; |" Rcious puberty in boys also results from inappropriate7 q2 G; z1 C" I" k5 u8 }" A
androgenic stimulation from either endogenous or
1 c4 S' a2 h+ Z3 T! v& k. iexogenous sources, nonpituitary gonadotropin stim-3 Q. e2 F; c* N5 R& [$ R7 e, o" e
ulation, and rare activating mutations.3 Virilizing
5 b, N$ p1 {: C% a# h. Ucongenital adrenal hyperplasia producing excessive
9 x. X; E2 H m: T4 J# ^! k6 q% {adrenal androgens is a common cause of precocious
- i4 ?1 a8 D- p" u& E" Bpuberty in boys.3,4
0 u$ p% ^9 }+ m0 CThe most common form of congenital adrenal
4 [" g4 |7 r: Ohyperplasia is the 21-hydroxylase enzyme deficiency.
: ~3 l6 ?6 c! r! U* g: @The 11-β hydroxylase deficiency may also result in
; [! j- ~* w3 xexcessive adrenal androgen production, and rarely,4 u' T; U2 F p( u& D
an adrenal tumor may also cause adrenal androgen
) }) I. a: i W1 ?4 fexcess.1,3
. U! P7 x3 F$ p9 nat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
9 Q/ A0 S6 c* Q4 y/ ^. [- ~4 q! J542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
- @" G1 {3 T# o9 n2 {A unique entity of male-limited gonadotropin-1 C8 e+ j) l. n8 ^8 G; }/ R3 K
independent precocious puberty, which is also known
4 V! I+ g1 D8 e! las testotoxicosis, may cause precocious puberty at a& p4 L- x$ {; y
very young age. The physical findings in these boys
! a F& ~! v1 E( k8 B0 E9 J; @with this disorder are full pubertal development,/ |/ Y& ~: E7 n9 w
including bilateral testicular growth, similar to boys
5 j5 {+ n! Z; w% C' E+ Uwith CPP. The gonadotropin levels in this disorder
; g, z9 e9 j6 B2 kare suppressed to prepubertal levels and do not show3 B" d" i9 C0 [0 m
pubertal response of gonadotropin after gonadotropin-- c7 H' _, x. P! x
releasing hormone stimulation. This is a sex-linked
3 u. B* h" g n3 V" w& Z, Q. ^autosomal dominant disorder that affects only! B5 N6 D/ C$ F
males; therefore, other male members of the family; Q; ?. H" V: l+ r. _3 x
may have similar precocious puberty.3' D2 h% j1 i/ L# E/ G% j7 N
In our patient, physical examination was incon-
. X4 Q3 a. q8 d% isistent with true precocious puberty since his testi-
! O& }& J6 q8 u' B5 Dcles were prepubertal in size. However, testotoxicosis4 Y1 ~7 B; q' e8 i2 M y3 @, T5 a' ^
was in the differential diagnosis because his father
: b" y6 S( e& ]+ gstarted puberty somewhat early, and occasionally,3 F' z/ R, `+ ^7 d) X" \
testicular enlargement is not that evident in the9 w+ J" M' S- O8 h
beginning of this process.1 In the absence of a neg-
) f3 B" `! [* V6 h7 Pative initial history of androgen exposure, our
% q% ?0 e2 {5 l% N, Rbiggest concern was virilizing adrenal hyperplasia,9 E/ }2 B2 |& j' z
either 21-hydroxylase deficiency or 11-β hydroxylase
; y& l8 Z, {4 u' G" k+ @deficiency. Those diagnoses were excluded by find-
3 H/ v5 r- ^5 [6 H- Ging the normal level of adrenal steroids.7 u7 i0 J1 z9 b# Z3 g! U `
The diagnosis of exogenous androgens was strongly2 ?5 _/ s$ _1 v5 i; K2 f2 N+ o
suspected in a follow-up visit after 4 months because
1 y( c+ [8 D" H0 B! Xthe physical examination revealed the complete disap-
6 H$ ?/ o5 H9 b& v% z/ Mpearance of pubic hair, normal growth velocity, and' B U$ J: p2 k6 J: \$ A v2 U
decreased erections. The father admitted using a testos-" p4 _* ~# k3 N) p
terone gel, which he concealed at first visit. He was( H1 r# y' D7 h; g. {
using it rather frequently, twice a day. The Physicians’
- N- N& _8 c2 f" k% |: n3 v2 |7 BDesk Reference, or package insert of this product, gel or/ D3 N) T: k5 N; a, r
cream, cautions about dermal testosterone transfer to1 P$ D! g7 R/ q* c% J; {4 Q
unprotected females through direct skin exposure.
; f. C0 g( R$ g2 H) Z6 [Serum testosterone level was found to be 2 times the
4 C/ ^1 o2 [- D; O% @baseline value in those females who were exposed to# p, ]6 u2 t% m' H# G" d8 I
even 15 minutes of direct skin contact with their male# x9 I. M6 F$ k( }
partners.6 However, when a shirt covered the applica-
* W2 R6 k" V% mtion site, this testosterone transfer was prevented.
- M" S8 `1 [# R' q$ IOur patient’s testosterone level was 60 ng/mL,) O1 @! @& U1 f
which was clearly high. Some studies suggest that+ ] P. k8 b9 J' M- Z' I6 Z
dermal conversion of testosterone to dihydrotestos-3 N$ x6 v6 z6 f! S0 |: v: a+ a: p
terone, which is a more potent metabolite, is more; ~" G( g3 z/ z' {9 Z# u
active in young children exposed to testosterone
0 }8 u* K( u5 Mexogenously7; however, we did not measure a dihy-( x" r8 }- V& T9 C; L- E
drotestosterone level in our patient. In addition to! a" H( b. m8 ]
virilization, exposure to exogenous testosterone in
9 }; B/ r; x4 [; z7 g& \& ichildren results in an increase in growth velocity and
9 D1 m0 i$ b4 L0 u4 J# @advanced bone age, as seen in our patient.
Y9 E4 z4 l0 X5 D8 n( sThe long-term effect of androgen exposure during
a$ @( F' }# Z2 T$ Wearly childhood on pubertal development and final( ~. j( R/ \- `' W! w7 z6 E G" j
adult height are not fully known and always remain( ?7 S* v) Q( _: a$ o' k: z. C: c5 c
a concern. Children treated with short-term testos-
7 F# H; r" Y% ]3 M5 oterone injection or topical androgen may exhibit some# S/ h$ V6 P% d6 |; Z/ ^
acceleration of the skeletal maturation; however, after
3 P" j0 K' f- U& Q0 U2 h. t5 l& fcessation of treatment, the rate of bone maturation
8 w6 x5 q! e+ l) udecelerates and gradually returns to normal.8,91 ~ B+ m' G. q% Y5 X
There are conflicting reports and controversy& H* F* C" ?& W3 j$ K, o
over the effect of early androgen exposure on adult
. _1 D0 d1 J1 Rpenile length.10,11 Some reports suggest subnormal
" A5 b9 o: k: p: t6 P7 Uadult penile length, apparently because of downreg-
& g- Y4 L5 j. a1 _; z" v. gulation of androgen receptor number.10,12 However,
. j$ Y, n' X7 G1 M8 rSutherland et al13 did not find a correlation between! ]) @$ q% j4 d, \7 m
childhood testosterone exposure and reduced adult
, f# [3 N3 J: A7 {penile length in clinical studies.
f3 v$ K7 }1 I( S) `" ^8 QNonetheless, we do not believe our patient is
6 L7 b; {! e2 }+ _ pgoing to experience any of the untoward effects from; ?4 A' K% _; p- z2 j* `
testosterone exposure as mentioned earlier because& {7 j- s% p" s' x8 A6 b; p- G
the exposure was not for a prolonged period of time.
+ m, u$ ]& h% f4 w1 E0 W: R/ ~3 yAlthough the bone age was advanced at the time of6 w, W1 M. U% y }
diagnosis, the child had a normal growth velocity at
$ f+ j" `5 {9 _6 i# p& M8 x3 vthe follow-up visit. It is hoped that his final adult
5 F+ m& Y# T* y* e, Y6 W9 Hheight will not be affected.
- \7 g q% R. g- _6 X) H' tAlthough rarely reported, the widespread avail-
E( B# b; O3 ^6 k8 F# J$ mability of androgen products in our society may
+ I# u$ f: u9 t2 [/ w Eindeed cause more virilization in male or female
0 K2 q L; J, j0 _/ Z4 o5 Z& S' Kchildren than one would realize. Exposure to andro-4 s& e2 B' a! i$ }& {% i
gen products must be considered and specific ques-
# f: Y2 y, p5 G2 z8 ?tioning about the use of a testosterone product or: I! ~/ z. w/ S! u
gel should be asked of the family members during
0 I4 I3 _0 B% X: R0 h& Qthe evaluation of any children who present with vir-$ v, ^9 O; z; w+ V7 N
ilization or peripheral precocious puberty. The diag-
; D2 m0 @! T/ L$ z# i8 k' `nosis can be established by just a few tests and by. [: o9 a8 Y! t a3 t
appropriate history. The inability to obtain such a2 l+ J5 b2 R% l0 y8 M
history, or failure to ask the specific questions, may
6 z7 g6 @& |( i$ A. presult in extensive, unnecessary, and expensive' Y( n% R, n7 U, W7 o. u4 h' k
investigation. The primary care physician should be8 _3 {1 M: `2 n+ H! N( [5 d: Y5 A* @+ d
aware of this fact, because most of these children: z3 C2 K# {" Z1 E% J, D
may initially present in their practice. The Physicians’3 C; t8 i! k9 l" n# a
Desk Reference and package insert should also put a ?& G6 |. x- V
warning about the virilizing effect on a male or
& Q& O( N; Z5 n- e$ |; C9 qfemale child who might come in contact with some-; v: D a1 \4 w( M) h, U8 U' l
one using any of these products.3 I( [9 K1 ^# b( N% T; R! A
References
% _) Q8 `9 `: v1. Styne DM. The testes: disorder of sexual differentiation( {$ y+ B$ r( u- Z, }
and puberty in the male. In: Sperling MA, ed. Pediatric
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5 x. S/ X7 ?# t- b2 t6 Q! y2 L# ^6 ~2002: 565-628.
# l1 q2 k" v- u4 i2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious6 V; \$ w; s, q
puberty in children with tumours of the suprasellar pineal
" h# J- E, i& O0 X# Yat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
4 d( |, }- i8 {/ Z9 U! t- l$ A& NTopical Testosterone Exposure / Bhowmick et al 543
. ~5 ^! l) @! i+ c2 a6 S7 O/ Zareas: organic central precocious puberty. Acta Paediatr.6 e, |- _+ B, D9 T; M5 t$ I
2001;90:751-756.! }& C5 a6 o8 B) s. a1 d
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.# L# E5 n; Q6 G1 P0 p$ i
Pediatric Endocrinology. 4th ed. New York, NY: Marcel
, f: S V M, {' o* a. |) @Dekker Inc; 2003:211-238.
{6 A; v- F+ G2 d+ @4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual* I& t- S2 L. P2 U- J/ {
development in a two-year-old boy induced by topical
& v. `2 b8 @' [exposure to testosterone. Pediatrics. 1999;104:e23.
" V( @* L# E5 X ~( F' P7 _5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
# ]% N5 W7 z$ r7 U: cSkeletal Development of the Hand and Wrist. 2nd ed.
: F4 G/ w: f R$ LStanford, CA: Stanford University Press; 1959.
: I+ }3 n' h, l; S+ F6. Physicians’ Desk Reference. Androgel 1% testosterone,1 F9 r, V9 V: B- k
Unimed Pharmaceutical Inc. Montvale, NJ: Medical" L& o# q9 b& R D5 D. R, N. T( H
Economics Company, Inc; 2004:3239-3241.
# u0 P( H1 Z5 l& P2 O, {7. Klugo RC, Cerny JC. Response of micropenis to topical) U' Q- z% _6 y! \) y9 r
testosterone and gonadotropin. J Urol. 1978;119:
8 q5 |9 [/ s! O% A# a667-668.4 F: X4 ]% n; ]4 m
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