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is a significant concern for physicians. Central1 D7 s7 t+ }5 K2 V+ j+ |
precocious puberty (CPP), which is mediated
5 |/ b" m, `4 b3 M- ~/ Lthrough the hypothalamic pituitary gonadal axis, has4 {, h m/ K4 D9 i
a higher incidence of organic central nervous system/ p3 l: j9 A- e/ s. `+ l
lesions in boys.1,2 Virilization in boys, as manifested
' L" X5 h+ _" C, Qby enlargement of the penis, development of pubic( d6 x% F4 `* {. R, ^
hair, and facial acne without enlargement of testi-" y$ u* H6 P: G* {6 k7 c
cles, suggests peripheral or pseudopuberty.1-3 We6 Y, z) h/ i* H2 _. W' m! S
report a 16-month-old boy who presented with the# e' z$ G1 k" u3 X3 j
enlargement of the phallus and pubic hair develop-
$ j2 m2 F0 X( \; m# X9 O3 K7 cment without testicular enlargement, which was due& Z% o) o. F7 Y6 H( u" z/ w3 p( Y
to the unintentional exposure to androgen gel used by# D( h+ e. y6 v
the father. The family initially concealed this infor-
& b1 x5 \6 t* T# l9 q& V( Y0 d6 _mation, resulting in an extensive work-up for this1 M/ V& N) T3 h9 o
child. Given the widespread and easy availability of
* e( v2 \% q$ i5 ^7 \testosterone gel and cream, we believe this is proba-
K4 p! S6 n) [5 G- ]: _bly more common than the rare case report in the7 j( v/ Q% G+ }( i+ |
literature.4' R/ h, Y- x7 ~7 L1 ?4 ]$ L
Patient Report! `! N* D. n( M
A 16-month-old white child was referred to the
( L( z0 V8 s5 \# }endocrine clinic by his pediatrician with the concern
0 C, r& T" d/ W# N' [" Tof early sexual development. His mother noticed! u, s( x: M( j# y5 N, h0 Q
light colored pubic hair development when he was
" {7 [1 x& ^& a yFrom the 1Division of Pediatric Endocrinology, 2University of$ X" }( F1 G( ~1 ~
South Alabama Medical Center, Mobile, Alabama.
i& b/ N) R u/ \. D* vAddress correspondence to: Samar K. Bhowmick, MD, FACE,& l1 A& w& u; x' ~3 ~ b- | P
Professor of Pediatrics, University of South Alabama, College of; U2 L! f3 `% P2 f; N2 \* a4 b
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;2 u+ I( v6 F" o3 f! e& V* ~' F( A0 b
e-mail: [email protected].- Z- Q# y3 Y1 o
about 6 to 7 months old, which progressively became* E3 w" q9 c) c# B1 _' p# Z; L
darker. She was also concerned about the enlarge-! H, n3 Z4 o0 B3 `# E/ ^: w3 i/ B6 z
ment of his penis and frequent erections. The child
+ b) l' \4 m7 [; \2 G0 Dwas the product of a full-term normal delivery, with3 [8 D) q* K F8 J
a birth weight of 7 lb 14 oz, and birth length of
3 G- \3 F0 X# w0 _: N$ Q7 B4 X20 inches. He was breast-fed throughout the first year
# n5 ^! y- }2 vof life and was still receiving breast milk along with9 B$ B# d, \' z! B# W5 t5 m* I3 b
solid food. He had no hospitalizations or surgery,
8 \7 z2 G3 w; [+ tand his psychosocial and psychomotor development
, q' K: D* J4 `was age appropriate.
* e. {, c# [- z: `3 J2 i/ QThe family history was remarkable for the father,7 e/ y) u. x. n2 c/ @% I" q+ J5 h1 [
who was diagnosed with hypothyroidism at age 16,
3 A6 I- w- A' A& q/ F; {which was treated with thyroxine. The father’s4 X. b3 J% `( u) I3 F$ e
height was 6 feet, and he went through a somewhat, i; D) E3 Z" F, V9 [2 Y6 j' O2 M% J- j
early puberty and had stopped growing by age 14.
) [+ B C$ z E/ x q2 IThe father denied taking any other medication. The
- ~0 s; ?7 \3 n+ G& v0 nchild’s mother was in good health. Her menarche
7 d' X! H+ @5 k: X4 M* ^was at 11 years of age, and her height was at 5 feet
1 \& r6 U/ D, u O7 k+ d4 Q% O5 inches. There was no other family history of pre-# q( @$ Z8 f) v3 I1 i! l1 f i6 t
cocious sexual development in the first-degree rela-
" M# c q- J3 h& p+ ytives. There were no siblings.
5 a0 ~7 b `# ]/ g! SPhysical Examination
# ?0 p8 D m1 m3 Z% ]- C# bThe physical examination revealed a very active,9 @' K+ Z* _4 N8 ~7 K) D$ b
playful, and healthy boy. The vital signs documented6 P$ j8 a$ H3 A+ @9 l6 k) f# Y V
a blood pressure of 85/50 mm Hg, his length was
' l8 @$ }4 |7 j7 f+ v3 s/ F* k2 L90 cm (>97th percentile), and his weight was 14.4 kg
& b! r, I3 x" v5 h(also >97th percentile). The observed yearly growth
: D, X- p; h A; {6 W: ~4 }/ m3 rvelocity was 30 cm (12 inches). The examination of
6 s2 k! _6 B* F6 r2 tthe neck revealed no thyroid enlargement.
) g$ J) U7 G* H& }4 TThe genitourinary examination was remarkable for% k) k0 \5 E+ H, x
enlargement of the penis, with a stretched length of
y2 F, v+ L9 j% \8 cm and a width of 2 cm. The glans penis was very well
7 u4 A) u" f% P" b, o/ x1 Y! cdeveloped. The pubic hair was Tanner II, mostly around# r: O2 E: f$ V: _/ ?. M3 Z
5408 L$ \% v' x/ H9 {6 H6 l# o
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from8 F4 K) T S7 M1 z2 V- L: x! p
the base of the phallus and was dark and curled. The9 P+ e# p+ N2 S8 U" r
testicular volume was prepubertal at 2 mL each.* L' c! y6 P9 y8 m1 `
The skin was moist and smooth and somewhat
* w+ P$ k4 F( U F3 d3 h- Joily. No axillary hair was noted. There were no! m; e4 f- a( [/ e
abnormal skin pigmentations or café-au-lait spots.
- A; U5 P/ L$ R8 z; V/ fNeurologic evaluation showed deep tendon reflex 2+! o6 V+ m# F* m- N V
bilateral and symmetrical. There was no suggestion' C! V$ Y5 |+ z9 g! o
of papilledema.
9 y( ~% F: }( o4 ^: p3 ~' T1 tLaboratory Evaluation+ ^: a, s: E) r O
The bone age was consistent with 28 months by
7 r) f+ n! D: [0 W4 P) c& I1 l6 ^( zusing the standard of Greulich and Pyle at a chrono-
2 r& M. J% ~ n" S: N5 r+ {logic age of 16 months (advanced).5 Chromosomal, A5 P9 Y1 x5 }* c+ x
karyotype was 46XY. The thyroid function test( B1 V: k' L6 d: c7 J- g8 D) E
showed a free T4 of 1.69 ng/dL, and thyroid stimu-. m4 V0 l& |9 y& g7 Z9 l
lating hormone level was 1.3 µIU/mL (both normal).1 O: n2 ?. T9 x
The concentrations of serum electrolytes, blood
) t% V# X1 M+ ^' A. Yurea nitrogen, creatinine, and calcium all were$ j/ M2 [$ u7 ^% Z8 Q
within normal range for his age. The concentration
2 O5 {5 W$ _. V4 P3 b0 N8 K$ vof serum 17-hydroxyprogesterone was 16 ng/dL2 y! g; R9 u/ [: Z. C
(normal, 3 to 90 ng/dL), androstenedione was 203 O; e! w1 f& ]
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
9 m7 u |2 h( Z3 i0 P% T3 ]terone was 38 ng/dL (normal, 50 to 760 ng/dL),! q/ b+ B5 [6 I2 ?% e
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
6 s6 e$ @% m- J: _1 J49ng/dL), 11-desoxycortisol (specific compound S)! {* s+ X$ \1 {) `9 W6 M: V/ e8 W# W
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-7 K; h r* X5 Z8 Z) I) S
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total5 ]2 ], @. O% M
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),+ }4 f8 \/ K% i l4 z: s
and β-human chorionic gonadotropin was less than
1 Q0 D- v8 X! F5 s5 mIU/mL (normal <5 mIU/mL). Serum follicular+ k0 P: ?: X8 M( n4 [
stimulating hormone and leuteinizing hormone. X: @2 e2 U$ x
concentrations were less than 0.05 mIU/mL) d3 K. y& {/ P# E
(prepubertal).! @: j+ Y6 ?" c* Q
The parents were notified about the laboratory
, q2 [# z1 W! {: U0 ?6 @1 {results and were informed that all of the tests were
5 T0 C( r# x, _0 H! T9 e2 E# Vnormal except the testosterone level was high. The2 L6 L# f5 e) U
follow-up visit was arranged within a few weeks to# R, U4 B2 x2 m) R) N
obtain testicular and abdominal sonograms; how-
) u7 j7 B/ z' Fever, the family did not return for 4 months., E% a' P. M' U
Physical examination at this time revealed that the
4 |" Y ]# {% ]7 S& I+ {% Gchild had grown 2.5 cm in 4 months and had gained
( ^: b _& @ b, p3 K0 l3 W8 z2 kg of weight. Physical examination remained
" }% N, C4 |! F; L5 s9 n( Hunchanged. Surprisingly, the pubic hair almost com-2 c" D5 L4 z L: Z% P
pletely disappeared except for a few vellous hairs at& Y, R6 W4 ]7 c
the base of the phallus. Testicular volume was still 22 P }' P" |6 S; ^2 p2 p% c
mL, and the size of the penis remained unchanged.
) c6 ~2 T6 k2 Y9 O2 yThe mother also said that the boy was no longer hav-
8 B$ Y5 G/ L( x4 D5 z. r. X3 ping frequent erections.
5 o8 t: u% Q) {' W0 `0 HBoth parents were again questioned about use of" Y( `% l3 L; @/ c/ v
any ointment/creams that they may have applied to: {8 @% T+ h0 G( E( x
the child’s skin. This time the father admitted the3 F' Y) ]- U5 {( o
Topical Testosterone Exposure / Bhowmick et al 541
# i# b! d# e9 d- d3 a: O% q6 \use of testosterone gel twice daily that he was apply-* V; Y. L- R* d' q" Z# ]8 a
ing over his own shoulders, chest, and back area for
1 y! L& ^( s7 ]( O- Ja year. The father also revealed he was embarrassed
* q0 @- B2 M! X3 M% J9 lto disclose that he was using a testosterone gel pre-. T, N* }. U6 P- c/ N# [% B
scribed by his family physician for decreased libido5 @+ H% C! Y/ K9 N6 C9 `1 f2 a
secondary to depression.2 [+ r' h( |' T+ O. M
The child slept in the same bed with parents.
9 ~0 u5 p R3 ` _& x: D u7 s; c1 s* eThe father would hug the baby and hold him on his
+ H/ i9 y( k3 k; ~, }; Achest for a considerable period of time, causing sig-
8 z5 Z* K# ^8 Enificant bare skin contact between baby and father.& v \" T. r$ u0 U
The father also admitted that after the phone call,1 ]8 s; q. u* m3 @+ ^( l& X; a
when he learned the testosterone level in the baby
+ l; T/ A; J6 ?' e' U$ n: \" _was high, he then read the product information- h( V f* N& T1 v0 y1 k
packet and concluded that it was most likely the rea-2 N, J; F2 \$ N' _! Q9 j: R
son for the child’s virilization. At that time, they
U' A7 { ?- P2 k1 \ S! `# M @decided to put the baby in a separate bed, and the" r% h0 y% D- L; G# P* u
father was not hugging him with bare skin and had
" X4 n/ N: |: q% G2 Ybeen using protective clothing. A repeat testosterone! N0 ^" l8 m, N1 \2 J. e
test was ordered, but the family did not go to the
3 j( L9 _, J4 l1 _! qlaboratory to obtain the test.
0 E! @9 X5 Q4 [8 o6 f1 ]2 HDiscussion
+ ~9 `5 T$ G0 x) j/ ZPrecocious puberty in boys is defined as secondary1 _ z+ G* s* d$ e$ J$ o$ y
sexual development before 9 years of age.1,4
|, }2 K6 D0 L- U) kPrecocious puberty is termed as central (true) when
1 X# j- s9 O% e/ Kit is caused by the premature activation of hypo-. ^6 j2 A0 P1 B: Z5 j
thalamic pituitary gonadal axis. CPP is more com-7 ]: C; \% P. P( Q5 h" ^' Z9 ^5 ^
mon in girls than in boys.1,3 Most boys with CPP1 J& e$ x4 _% G, u5 q0 _
may have a central nervous system lesion that is5 E- X% y3 T v" X: G9 T
responsible for the early activation of the hypothal-
1 {* a! ?) _6 I5 }* p; Pamic pituitary gonadal axis.1-3 Thus, greater empha-
) b' S, e2 C9 i* z, r" i7 b5 @sis has been given to neuroradiologic imaging in9 _+ F6 {& S+ [7 A1 T# B4 ]
boys with precocious puberty. In addition to viril-5 _" m- ~2 H$ X( N; T/ g
ization, the clinical hallmark of CPP is the symmet- k: X: e Y5 ^9 r/ @
rical testicular growth secondary to stimulation by) A& |5 m" x; C* G5 Y$ @
gonadotropins.1,3
! x4 C; A' W1 HGonadotropin-independent peripheral preco-
' L) ?3 c K" L& @cious puberty in boys also results from inappropriate% l8 A, f- Z4 {
androgenic stimulation from either endogenous or& t+ \: t' B( X; I
exogenous sources, nonpituitary gonadotropin stim-/ i1 \" T8 r& {4 }. _ i' q2 t1 h) Z
ulation, and rare activating mutations.3 Virilizing
: ? @' X8 I: c$ A4 G. }0 ocongenital adrenal hyperplasia producing excessive
' Y r. k, d N# w5 L6 a9 L$ Badrenal androgens is a common cause of precocious
) N' E# z: S2 spuberty in boys.3,43 q& Z, H4 L- f) p) F
The most common form of congenital adrenal$ D; b/ }5 M {4 _) u
hyperplasia is the 21-hydroxylase enzyme deficiency.
. i/ u9 D. b" p/ fThe 11-β hydroxylase deficiency may also result in% A) H8 `0 g, e" i- ?- ~# ?' Y
excessive adrenal androgen production, and rarely,; t7 `2 H1 J7 b$ k5 k6 C$ o
an adrenal tumor may also cause adrenal androgen" m; e8 J3 ^+ Z- y
excess.1,3
1 ^- G+ l t3 ]! F4 uat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
. `4 @' m% m M542 Clinical Pediatrics / Vol. 46, No. 6, July 2007) ^2 Y! G/ f9 s" W0 v
A unique entity of male-limited gonadotropin-
, a0 T) }5 i4 P& Windependent precocious puberty, which is also known/ w+ w4 u* Y9 z) z: j3 t
as testotoxicosis, may cause precocious puberty at a1 i x! s" F4 A, i
very young age. The physical findings in these boys/ ?9 ]1 a2 J' D6 m
with this disorder are full pubertal development, m3 a0 M0 A; p+ N2 }
including bilateral testicular growth, similar to boys
# ~ i' Q q" f$ @) d% m2 I, Zwith CPP. The gonadotropin levels in this disorder* N! J7 P* a5 f/ Q6 _ m
are suppressed to prepubertal levels and do not show% p& h1 j3 E3 W+ _! f
pubertal response of gonadotropin after gonadotropin-9 ^2 A3 y+ D1 Q. m
releasing hormone stimulation. This is a sex-linked3 N: {2 h) M* U
autosomal dominant disorder that affects only- a7 e6 W& }( i
males; therefore, other male members of the family( e1 a. m/ C6 N; v, \$ {2 t+ J6 ?
may have similar precocious puberty.3
+ d& }- d1 j+ C! V1 n n! MIn our patient, physical examination was incon-) G' v8 ?" o1 b4 f, N
sistent with true precocious puberty since his testi-
: y Q$ @5 N# Z* c# {$ T4 wcles were prepubertal in size. However, testotoxicosis
* L2 S$ _" ]- p' S1 Xwas in the differential diagnosis because his father
. m! h1 B* [8 _5 G- dstarted puberty somewhat early, and occasionally,1 p& k( l; J( D8 r2 c, e
testicular enlargement is not that evident in the' S* g9 i' [. y- R
beginning of this process.1 In the absence of a neg-
- q |- h" O" Z! Q) K# G7 k* Oative initial history of androgen exposure, our6 U) X' a. C. H- ^
biggest concern was virilizing adrenal hyperplasia,
7 M6 [( g" c% }) q0 d2 }either 21-hydroxylase deficiency or 11-β hydroxylase
& x- C x' D+ c( Adeficiency. Those diagnoses were excluded by find-5 ^/ G+ u d* C) ]2 @
ing the normal level of adrenal steroids.
' @2 }, R& V$ V$ G) i0 w; XThe diagnosis of exogenous androgens was strongly
) I! I ]8 {4 B5 Q8 g! h6 h1 W. psuspected in a follow-up visit after 4 months because# ]4 Q' |/ e- f8 o: @
the physical examination revealed the complete disap-0 s$ q4 {' [" H' W/ _
pearance of pubic hair, normal growth velocity, and5 F' L9 _" K9 Y
decreased erections. The father admitted using a testos-
& [6 b D: e5 m: N0 aterone gel, which he concealed at first visit. He was
% |8 G: d. ]% s! {using it rather frequently, twice a day. The Physicians’
( `% r/ Q/ Z7 ZDesk Reference, or package insert of this product, gel or
8 |* b' ~& d- {& B. ]% o2 P; Scream, cautions about dermal testosterone transfer to" W8 V$ a0 }- S4 i
unprotected females through direct skin exposure. }$ S4 h2 q5 C
Serum testosterone level was found to be 2 times the
) {" h+ P( ~) E, h) F5 E: sbaseline value in those females who were exposed to/ _% ]! o! |. c6 J
even 15 minutes of direct skin contact with their male
6 C6 j5 ]% `. k% Ipartners.6 However, when a shirt covered the applica-
! n, ?2 ~7 u0 E5 E7 j" o8 e6 z- etion site, this testosterone transfer was prevented.9 q+ V n$ J3 K+ ~/ A
Our patient’s testosterone level was 60 ng/mL,1 a( p6 `4 Z6 q* Y$ W5 s
which was clearly high. Some studies suggest that
$ n* Y) K# |- Pdermal conversion of testosterone to dihydrotestos-5 \ c, \% P9 l) F
terone, which is a more potent metabolite, is more2 @! B& I* q F4 D) \- p
active in young children exposed to testosterone
1 }# A# {$ f2 c) }7 |exogenously7; however, we did not measure a dihy-9 D5 [7 W3 N. f: b5 W$ E( C2 Y
drotestosterone level in our patient. In addition to. X5 t+ j# t% @ f' d) B
virilization, exposure to exogenous testosterone in
4 t% l& F5 u& lchildren results in an increase in growth velocity and9 T9 P8 P V) J/ C% S/ G0 [
advanced bone age, as seen in our patient.7 A% d8 H- q$ ?" x) ]
The long-term effect of androgen exposure during
+ ~& T4 ^) ?3 g9 u5 Jearly childhood on pubertal development and final
! V0 j& |0 A4 K% V' g6 ]0 Iadult height are not fully known and always remain
* L& O$ D4 Q% `, R5 Ua concern. Children treated with short-term testos-) }& U% R) S* A1 D$ j$ J6 M: u
terone injection or topical androgen may exhibit some; D8 s3 Z* d7 e, c/ V( m7 d
acceleration of the skeletal maturation; however, after
1 I7 H. P( [4 G& S/ Z/ |4 Bcessation of treatment, the rate of bone maturation" e( T4 m, i4 S: H# R0 l: y4 F$ d
decelerates and gradually returns to normal.8,9 J: A2 G5 J: L* p) r* ?$ w
There are conflicting reports and controversy
# ] {4 s7 i1 e* \over the effect of early androgen exposure on adult b1 Q7 r* }# P, m. V$ G! L9 T
penile length.10,11 Some reports suggest subnormal
$ L5 o2 ^# \* n3 [6 jadult penile length, apparently because of downreg-
Y+ c0 `6 a/ U- s+ t, Xulation of androgen receptor number.10,12 However,
s5 W* x, ~# J; i( M, d- W6 }9 cSutherland et al13 did not find a correlation between1 m1 T' W4 q: z9 E0 Z
childhood testosterone exposure and reduced adult
+ l! u2 N! ~* g6 G+ X+ V" n1 Zpenile length in clinical studies.5 S3 K6 t' G. Z/ g, p! O! h
Nonetheless, we do not believe our patient is
' d: ]2 Y3 X m, Sgoing to experience any of the untoward effects from
! C/ n6 G! t* I; c( ctestosterone exposure as mentioned earlier because9 b' N1 e e9 x* [$ Q
the exposure was not for a prolonged period of time.
2 z+ z5 f- _0 v& l( nAlthough the bone age was advanced at the time of
5 |7 x$ F* b! ` Ndiagnosis, the child had a normal growth velocity at
0 f/ c3 E: ?. b5 ?+ `the follow-up visit. It is hoped that his final adult
9 u5 ~/ Y$ n' y2 }" iheight will not be affected.
6 w0 Q! A( `2 ]- j5 _Although rarely reported, the widespread avail-* Q. H/ V9 ~( P" r& R/ y" R
ability of androgen products in our society may
& `3 F; D% C# G0 C4 D" F2 tindeed cause more virilization in male or female
0 B: f ]3 S) Cchildren than one would realize. Exposure to andro-
! G1 }% P4 I/ S! C7 R1 ngen products must be considered and specific ques-
+ C8 E7 p' K* y8 [8 {$ Btioning about the use of a testosterone product or- O1 O8 f3 [' S0 t5 k- F: Q
gel should be asked of the family members during- \# B" S5 q6 \$ _4 `9 M+ e
the evaluation of any children who present with vir-& m2 o1 y* u/ c' V* r
ilization or peripheral precocious puberty. The diag-
7 Z7 |% e8 T6 Knosis can be established by just a few tests and by9 x& X$ y8 U% ]$ m
appropriate history. The inability to obtain such a
, y' e2 m/ r3 t4 Lhistory, or failure to ask the specific questions, may
H4 k2 T: v& J: Tresult in extensive, unnecessary, and expensive, Y) C8 V3 L9 c4 H
investigation. The primary care physician should be
2 d. d* l5 f- j$ G3 v" oaware of this fact, because most of these children/ y4 Z; Q7 {+ R
may initially present in their practice. The Physicians’, G6 s5 D: ^6 z4 Y
Desk Reference and package insert should also put a
* `: S' ~4 _- |, Gwarning about the virilizing effect on a male or/ [5 V- L, C/ n: h
female child who might come in contact with some-: n' _% W* Q/ V8 C& [6 w
one using any of these products.' v; W! n: F& Z. ^% S- X
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